Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Dependent Failure"”.
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Nonlinear temperature dependent failure analysis of finite width composite laminates
… Curing stresses are calculated using temperature dependent elastic properties that are input as percent retention curves, and stresses due to mechanical loading in the form of an axial strain are calculated using tangent modulus, obtained by Ramberg Osgood parameters. It is shown that curing …
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Life prediction of fiber-reinforced composites: macro- and micro-mechanical modeling
… at the lamina level while the latter evaluates failure processes at the fiber-matrix level. In the first part of this study the remaining strength life prediction methodology MRLife, modified for ceramic composites (CCLife), is integrated into the finite element package CSTEM. to create an …
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Qualitative Reasonings With Deep-Level Mechanism Models for Diagnoses of Dependent Failures (Artificial Intelligence)
… diagnoses have been based on the "single failure" assumption even though multiple failures are main concerns in the real world. In this research, we concentrate on a subclass of multiple failures, called dependent failures, where a primary failure may induce subsequent secondary …
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The influence of alloy composition and interfacial segregants on the fracture and fatigue of metal/ceramic interfaces
… materials. As a result, the need to assess their failure is critical. Diffusion bonded joints, thermal-barrier and wear resistant coatings, and thin films in VLSI electronics are three examples. In each of these cases, elastic and plastic mismatch between layers, when combined with thermal and/or …
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Quantifying the relationship between wind turbine component failure rates and wind speed
… the mean wind speed on the day of each recorded failure that resulted in corrective maintenance. A methodology is proposed in this thesis to define the relationship between wind turbine component failure rates and wind speed using Bayes Theorem. With these relationships known and wind speed …
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Probabilistic risk analysis of restructured electric power systems : implications for reliability analysis and policies
… models are proposed that incorporate dependent failure modes and capture the behavior of economic agents, neither of which is considered with current adequacy techniques.
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Accelerated Testing Method to Estimate the Lifetime of Polyethylene Pipes
… to quickly develop predictions of the time-to-failure under different loading levels allows designers to choose the best polymeric material for a specific application. Additionally, it helps material producers to design, manufacture, test, and modify a polymeric material more rapidly. In the …
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Stent Reliability and Maintenance: Integrating Probabilistic and Physics-of-Failure Models
… implant devices has raised new challenges to the failure analysis and reliability study of such new devices. More than one million stents are implanted in human arteries each year. These devices are subject to a wide range of stress due to biological and procedural factors. Fatigue and structural …
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An Optimal Pipe Replacement Scheduling Model for Water Distribution Systems
… enables the use of threshold break rate with the failure intensity and hazard functions is developed. The methodology is drawn by considering the relationships of the definitions of the threshold break rate with intensity and hazard functions in the context of a repairable system's failure process …
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Analysis and behavior of preexisting landslides
… difficult. Skempton (1964) concludes that if a failure has already occurred in clayey soils, any subsequent movement along the preexisting slip surface will be controlled by the drained residual strength. Skempton (1985) suggests that the strength of a clay also will be at or close to the …
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Resistive Switching Behavior in Low-K Dielectric Compatible with CMOS Back End Process
… cells. The BEOL reliability is tied to time dependent failure that occurs inside dielectric between metal lines. Assessing the suitability of covalent dielectrics for back-end metallization is therefore an interesting topic. TDDB measurements have been performed on pure covalent materials, …
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Integrated System Model Reliability Evaluation and Prediction for Electrical Power Systems: Graph Trace Analysis Based Solutions
… provides a means of computationally handling dependent outages and cascading failures. The effects of adverse weather, time-varying loads, equipment age, installation environment, operation conditions are considered. Sequential Monte Carlo simulation is used to evaluate the reliability changes …
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Reliable facility location design and traffic sensor deployment under probabilistic disruptions
… mainly due to the large number of possible failure scenarios. In this Ph.D. research, we will overcome this challenge by developing a range of innovative modeling methods, and then generalize the methodologies to address supply chain design and traffic surveillance sensor location problems. …